Question

If 10, x + 5, ... ... , 3x, 35, ... .. is an arithmetic sequence, find its 7th term.​

Answer 1

Answer:

40

Step-by-step explanation:

d1 = x+5-10

d1 = x-5

d2 = 35-3x

d1=d2

x-5 = 35-3x

4x = 40

x = 40/4

x = 10

d = 10-5

d = 5

an= a+(n-1) d

a7 = 10+(7-1)5

a7 = 10+6×5

a7 = 10+30

a7 = 40

Anuj Agrawal

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